
Bob up
Unexpected Situations
 Use 'bob up' to express that something happened without warning or foresight. 
I had everything planned, but then a new problem bobbed up.
 Sudden Visibility
 'Bob up' illustrates someone or something suddenly coming into view or attention. 
In the middle of the discussion, an old memory bobbed up.
 Impromptu Opportunities
 Use 'bob up' when speaking about unexpected chances cropping up. 
Keep your eyes open; a great opportunity might just bob up.